Nicely coinciding with Apple's iOS and OS X security fixes–if you haven't downloaded them yet stop reading and go do it right away–and with Samsung's own questionable implementation of fingerprint scanning, Apple's released a pretty detailed PDF outlining iOS security. It's fairly readable–you could skip the more technical sections and still get a good idea of what's going on–and it provides more information than we've had before on how Touch ID and the A7's Secure Enclave works. Pretty nice.